amplifier goes into protection

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pitoaudiovisual

Copper - Posts: 388

Joined: April 25, 2005

Location: Pennsylvania, United States

Posted: April 17, 2007 at 10:11 PM / IP Logged

my amplifier keeps going into protection when i raise the radio volume so im just wondering why would an amp go into protection. The speakers are 1200 watts each and i have two but the amp only pushes 1000 watts so its lower that each speaker and i bridge it and the ohms from the speakers are at 4 ohm together and the amp is 2 ohm stable so im wondering why.. my radio has a setting for subwoofer and i keep it on +2 and the amps power is at half so any info would be very helpful...

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DYohn

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Joined: April 22, 2003

Location: Arizona, United States

Posted: April 17, 2007 at 10:17 PM / IP Logged

Please post the make/model of the amp and the speakers. Did you upgrade the big 3? What vehicle? Stock alt or upgrade?

There are many reasons for an amp going into protection, including: gain too high, speaker impedance load too low, system voltage too low, bad ground on the amp, defective input cables or speaker output wires, defective amp, speakers shorting out, tinsel lead slap. To name the most common ones. Give us some more info and we might be able to help you.

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pitoaudiovisual

Copper - Posts: 388

Joined: April 25, 2005

Location: Pennsylvania, United States

Posted: April 17, 2007 at 10:42 PM / IP Logged

speakers are kicker comp L7 and the vehicle is a 93 Honda Civic and the battery is new but the alternator is stock.. I use to have another amp in my car before and it never did that .. I have an alpine head unit and the amp is a jensen 1000 watt. it says 2 ohm stable. I have a 0 gauge wire and the ground is also 0 gauge and i sanded the paint off for the ground. the tinsel are still good and the speaker wires are still installed.. the RCA cables are new and the voltage is stable even when the bass hits..

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stevdart

Platinum - Posts: 5,816

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Joined: January 24, 2004

Location: Pennsylvania, United States

Posted: April 17, 2007 at 11:03 PM / IP Logged

pitoaudiovisual wrote:

and the amps power is at half so any info would be very helpful...

The amp doesn't have "power" knobs. It has a gain. Carefully reset the gain according to the book...no shortcuts or guessing.

And here's one of your recent thread question. you have TWO DVC4 ohm subs. Total impedance after wired is either 1 ohm or 4 ohms. Do you have these subs wired to make a 4 ohm load on that Jensen? You didn't wire parallel / parallel, did you? And I don't believe a Jensen would claim 1000 watts into 4 ohms. That would be too much of a stretch. It must be a behemoth like this MTX TA92001. But wait...you said you "bridged it"...is this a two channel amp? What does the 1000 watts refer to?

Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.

pitoaudiovisual

Copper - Posts: 388

Joined: April 25, 2005

Location: Pennsylvania, United States

Posted: April 19, 2007 at 8:15 AM / IP Logged

sorry the amp is a Phonics Digital PD395, 1200 watts, 2 channel, bass boast and 2 ohm stable. what does LPF and HPF stand for..

Confidence is the key to any project!!

DYohn

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Joined: April 22, 2003

Location: Arizona, United States

Posted: April 19, 2007 at 8:29 AM / IP Logged

The amp is 2-ohm stable on each channel, meaning you must use no less than 4-ohms if you bridge the amp for a sub. This is why it's going into protection. LPF=low pass filter, HPF=high pass filter. If you are using this amp for a sub you should turn on the LPF and set it to 80-100 Hz. And set the gain properly (the forum SEARCH function is your friend.) BTW that amp is rated at 350 watts when bridged, and actual power output is probably closer to 200, so don't expect miracles from it.

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pitoaudiovisual

Copper - Posts: 388

Joined: April 25, 2005

Location: Pennsylvania, United States

Posted: April 19, 2007 at 6:45 PM / IP Logged

so if i want bass i should just put it on LPF right cause right now i have it on HPF and the bass hits but when i put it to LPF i dont hear anything

Confidence is the key to any project!!

DYohn

Moderator - Posts: 10,741

Joined: April 22, 2003

Location: Arizona, United States

Posted: April 19, 2007 at 7:17 PM / IP Logged

pitoaudiovisual wrote:

so if i want bass i should just put it on LPF right cause right now i have it on HPF and the bass hits but when i put it to LPF i dont hear anything

Put the Xover on LPF and adjust it to about 100Hz.

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pitoaudiovisual

Copper - Posts: 388

Joined: April 25, 2005

Location: Pennsylvania, United States

Posted: April 23, 2007 at 11:48 AM / IP Logged

i figured out what was wrong.. on the radio the RCA cables where coming out of subwoofer and the setting on the amp was for HPF which means that the bass was goin to the amp and the frequency was to low for the amp .. im i right or wrong..

Confidence is the key to any project!!

coppellstereo

Silver - Posts: 785

Joined: November 21, 2005

Location: United States

Posted: April 23, 2007 at 1:34 PM / IP Logged

if it was coming out of the subwoofer out on the HU then it was LPF, then at the amp it was HPF which means that it was probably offsetting the signal and nothing was happening.

Although, this would really have nothing to do with the amp going in to protection, it would just mean that you have a weird signal going to the woofer.

LPF 80Hz @12db/oct+ HPF 120Hz @12db/oct = ________

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